Distortion Hi-Res audio

Hi

I’m using Audirvana to play 24/96 files onto a Raspberry Pi 3+ with HifiBerry Digi+ Pro. Everything is up to date. I send signal through a high quality coaxial cable to an Edifier S2000 Pro that contains an internal Burr-Brown chip supporting a 24-bit 216-kHz resolution.

Music is distorted when playing above 48 Khz (I need to downsample it in Audirvana for it to sound good). Any ideas on what the issue could be?

Thanks
Bernardo